Can you explain more why your YouTube videos would cost $100 each to make? Is there no way you could make these for free maybe doing commentary or video essays on other people creating things?

I’d pick one at a time to jumpstart and give it a month then try the next. Doing 10% of each idea is only going to take more time and burn you out more if each starts demanding more of your time.

Many startup accelerators offer founder matching programs. Try looking around at places like YCombinator and see if they have any virtual networking events. Also check out some of their founder youtube videos as a few of them talk about choosing a cofounder and managing that relationship.

Good luck!